A few weeks ago i realized that when i hit the lock button on my key fob the beep or honk from the truck was becoming weaker and weaker and i believe that it is safe to say a prius's sounds louder and more masculine than mine does now. So i checked my actual horn to see if there was a problem with it...and same thing. And yes i did check all the electrical connections, etc. and they are all fine. So i checked where the horn is located in the truck and i believe that there are 2? For a high and a low pitch? (correct me if im wrong) So my question is i was looking at buying a horn like this http://www.summitracing.com/parts/WLO-851/ instead of just a factory replacement, would it be as simple as just connecting a few wires, would i also need an air compressor and tank?..or much more? HELP PLEASE!